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#define alloca __builtin_alloca x (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, x, y) { foo (alloca (8)); return a+b+c+d+e+f+g+h+i+j+k+l+m+n+o+p+q+r+s+t+u+v+x+y; }